pH of a solution is the negative logarithm of molarity of [tex]H^{+}[/tex] or [tex]H_{3}O^{+}[/tex] ion in solution.
Mathematically it is written as: [tex]pH=-log[H^{+}]=-log[H_{3}O^{+}][/tex] , where [tex][H^{+}]or [H_{3}O^{+}][/tex] represents molarity of [tex]H^{+}or H_{3}O^{+}[/tex] in solution.
Here [tex][H^{+}]=0.055 M[/tex]. So, [tex]pH=-log[H^{+}]=-log(0.055)=1.26[/tex]
